Question about GMC Denali

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1999 GMC Denali heater blower motor is always on high. The only way to stop it, while the vehicle is running, is to pull the 25A fuse. The switch does nothing, even in the "off" position.

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Hi,Sounds like your resister for your blower motor is shorted. this is mounted under the passenger side of the heater box where the blower motor is. This resister board has a reley mounted on it for high speed operation. very easy to change around 40 bucks at auto zone.

Posted on Aug 25, 2010

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1 Answer

I need to pull the fuse for the blower motor on a 1997 GMC 1500 Pickup


The "A/C" Fuse, a 25A fuse, controls the A/C and Blower Relays. Pulling this will remove power to the blower motor.

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Dec 17, 2014 | 1999 GMC Yukon Denali

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I have a 1999 GMC Suburban and the heater switch only works on high. Originally the heater fan did not work at all and then one cold morning I tried the switch and heard a loud clanking noise from the fan...


I'm 99% sure it is the blower motor resistor - common problem. Pull the panel off the passenger
side under the glove compartment. You'll see the blower assembly on the right side with a multi
colored wiring harness going to it. Disconnect the harness and pull out the reisitor, it'll have a gasket going around it to protect it from moisture and humudity. I have replaced 3 on my 1999, but the last one, I wrapped electrical tape around the exposed resistor. Might be luck, but this one has lasted me over 2 years now. While you have the panel dropped, I highly suggest chainging the air filter located there as well. Your AC will run more efficient.

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2 Answers

Blower motor continues to run when vehicle is off


Your problem is the Relay which is encased inside the Heater/AC Resistor Module. This is a very common problem with GMC and Chevy Trucks. The Relay's return spring fails and the relay is held closed by gravity. The only fix is to replace the Resistor Module. I have a 2004 Silverado and have replaced the Module 3 times and the Blower Motor twice. The Orange wire feeding the Module is always Hot (12V) and feeds the Relay Contact for Highest Blower Speed. Hence the Blower runs all the time even with the Key off and removed.

Oct 02, 2009 | 2003 GMC Envoy Xl

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1 Answer

1999 yukon denali blower motor not working


Check the dash fan control switch. It can be purchased separate from the whole cluster for under twenty dollars. The instrument panel cover comes off gently by hand with the tilt steering in the down position. You have to then unplug the electrical plugs to get it out of the way. The heater ac control panel then comes out by hand far enough to unscrew the heater fan control from the back. Auto Zone may have this part and have the step by step instruction to get the job done if needed. Good luck and hope this helps, if the fuse and relay is good, then it's going to be the switch. Keep me posted, be glad to help. 

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3 Answers

1999 yukon denali no ac or heat blowing


chk the fan speed resistors mounted in the fan housing. You should be able to see the wires going into the box with 2 screws holding the resistors in place. Good Luck.

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